CN115970466B - Lithium power battery electrolyte waste gas treatment process - Google Patents

Lithium power battery electrolyte waste gas treatment process Download PDF

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Publication number
CN115970466B
CN115970466B CN202310043594.3A CN202310043594A CN115970466B CN 115970466 B CN115970466 B CN 115970466B CN 202310043594 A CN202310043594 A CN 202310043594A CN 115970466 B CN115970466 B CN 115970466B
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air pipe
fixed bed
waste gas
bed adsorber
valve
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CN115970466A (en
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廖康维
李云飞
李木子
覃瑞卿
吴庆军
钟根林
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Zike Equipment Co ltd
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Zike Equipment Co ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Separation Of Gases By Adsorption (AREA)
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Abstract

The invention discloses a lithium power battery electrolyte waste gas treatment process which comprises a first air pipe, wherein one end of the first air pipe is connected with an alkaline washing tower, the top of the alkaline washing tower is connected with a second air pipe, the other end of the second air pipe is connected with a water washing tower, the top of the water washing tower is connected with a third air pipe, and the other end of the third air pipe is connected with a filter. The invention can realize the purification of VOCs organic waste gas, avoid polluting the atmosphere, ensure the physical and psychological health of staff and surrounding residents, has the advantages of large total air quantity, low concentration, unstable waste gas flow and concentration, has the organic waste gas purification efficiency of VOCs of more than or equal to 98 percent, stable operation, safety and reliability, has the non-methane total hydrocarbon, HF, particulate matters and the like of a discharge port far lower than the environmental protection discharge standard, can be stable for a long time, can realize the desorption regeneration of zeolite serving as an adsorbent during purification, and realizes the recycling of the zeolite.

Description

Lithium power battery electrolyte waste gas treatment process
Technical Field
The invention belongs to the technical field of waste gas treatment, and particularly relates to a lithium power battery electrolyte waste gas treatment process.
Background
Lithium power batteries are new high-energy batteries that have been successfully developed in the 20 th century. The negative electrode of this battery is lithium metal, mnO2 for positive electrode, SOCL2, (CFx) n, and the like. Practical use is made of the 70 s. Because of its advantages of high energy, high battery voltage, wide working temperature range, long storage life, etc., it has been widely used in military and civil small-sized electric appliances, such as mobile phones, portable computers, video cameras, etc., partially replacing the conventional batteries.
VOCs waste gas generated by the process of filling electrolyte into lithium power battery and sealing a rubber plug after filling the electrolyte is intermittently discharged, the air quantity is large, the concentration is low, the flow rate and the concentration of the waste gas are unstable, and the waste gas component is mainly carbonate generated by the electrolyte: dimethyl carbonate, methylethyl carbonate, ethylene carbonate, HF, and the like. This escape of exhaust gases can cause pollution to the atmosphere and affect the physical and psychological health of staff and surrounding residents.
Therefore, it is necessary to invent a lithium power battery electrolyte waste gas treatment process to solve the above problems.
Disclosure of Invention
In order to solve the problems, the invention provides a lithium power battery electrolyte waste gas treatment process for solving the problems in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: the lithium power battery electrolyte waste gas treatment device comprises a first air pipe, one end of the first air pipe is connected with an alkaline washing tower, the top of the alkaline washing tower is connected with a second air pipe, the other end of the second air pipe is connected with a water washing tower, the top of the water washing tower is connected with a third air pipe, the other end of the third air pipe is connected with a filter, one side of the filter, which is far away from the third air pipe, is connected with a fourth air pipe, one side of the filter is provided with a first fixed bed adsorber and a second fixed bed adsorber, the fourth air pipe is arranged as a three-way pipe, two ends of the fourth air pipe, which are far away from the filter, are respectively communicated with the first fixed bed adsorber and the second fixed bed adsorber, two ends of the fourth air pipe, which are communicated with the first fixed bed adsorber and the second fixed bed adsorber, are respectively provided with a first valve and a third valve, the utility model discloses a novel fixed bed adsorber, including first fixed bed adsorber, second fixed bed adsorber, fifth tuber pipe, third fixed bed adsorber, fourth fixed bed adsorber, first fixed bed adsorber, second fixed bed adsorber, third fixed bed adsorber, fourth fixed bed adsorber, fifth tuber pipe, the top of first fixed bed adsorber and second fixed bed adsorber is equipped with the fifth tuber pipe, the fifth tuber pipe is equipped with the third tuber pipe, the fifth tuber pipe is set up to the three-way pipe, the both ends of fifth tuber pipe respectively with first fixed bed adsorber and second fixed bed adsorber top intercommunication, the both ends that fifth tuber pipe and first fixed bed adsorber and second fixed bed adsorber communicate are equipped with second valve and fourth valve respectively, the one end that first fixed bed adsorber and second fixed bed adsorber were kept away from to the fifth tuber pipe is equipped with the adsorption fan, the other end of adsorption fan is connected with the chimney through the sixth tuber pipe, the outside of first fixed bed adsorber and second fixed bed adsorber is equipped with the desorption subassembly that is used for carrying out desorption regeneration to them.
Further, desorption subassembly includes the air-supplementing machine, the one end of air-supplementing machine is equipped with the air-supplementing mouth, the other end of air-supplementing machine is connected with the mixed flow case through the seventh tuber pipe, be equipped with the fifth valve on the seventh tuber pipe, one side of mixed flow case is equipped with the eighth tuber pipe, the eighth tuber pipe sets up to the third through pipe, the both ends that the mixed flow case was kept away from to the eighth tuber pipe are connected with first fixed bed adsorber and second fixed bed adsorber respectively, the both ends that the mixed flow case was kept away from to the eighth tuber pipe are equipped with eighth valve and sixth valve outward respectively, the outside of first fixed bed adsorber and second fixed bed adsorber is connected with the ninth tuber pipe jointly, the ninth tuber pipe sets up to the third through pipe, the both ends that ninth tuber pipe and first fixed bed adsorber and second fixed bed adsorber communicate are equipped with ninth valve and seventh valve respectively, the one end that first fixed bed adsorber and second fixed bed adsorber were kept away from to the ninth tuber pipe is equipped with the flame arrester, the opposite side that the flame arrester was kept away from to the eighth tuber pipe is equipped with the tenth tuber pipe, the one end that the flame arrester was kept away from the flame arrester is connected with catalytic combustion device, the other end that the catalytic combustion device was kept away from to the eighth tuber pipe is equipped with, the eleventh tuber pipe is connected with the thirteenth tuber pipe, the other end that the desorption is equipped with the thirteenth tuber pipe, the thirteenth end and the top to be connected with.
Further, the alkaline washing tower comprises a tower body, the front side of tower body is equipped with the receiver tank, the top of receiver tank is equipped with the water pump, the inside top fixedly connected with shower pipe of tower body, the bottom of shower pipe is equipped with the shower nozzle, the pumping end and the receiver tank intercommunication of water pump, the play water end of water pump passes through water pipe and shower pipe intercommunication, the inside of tower body and the below that is located the shower pipe are equipped with the packing layer, the inside of tower body and the top that is located the shower pipe are equipped with the dehydration packing layer, the inside fixed mounting of tower body has the otter board that is used for supporting packing layer and dehydration packing layer, the structural composition of water washing tower and alkaline washing tower is the same.
Further, the packing layer consists of PP hollow sphere packing with the diameter of 50 mm.
Further, sodium hydroxide lye is stored in the liquid storage tank of the alkaline washing tower, and aqueous solution is stored in the liquid storage tank of the water washing tower.
Further, the inside of the filter is sequentially provided with a primary filter, a medium-efficiency filter and a high-efficiency filter.
Furthermore, fixed beds are arranged in the first fixed bed adsorber and the second fixed bed adsorber, cellular zeolite is arranged above the fixed beds, and air holes for exhaust gas to pass through are formed in the fixed beds.
Further, the catalytic combustion device comprises a shell, wherein a heater, a catalyst storage rack and a heat exchanger are sequentially arranged in the shell from bottom to top, and a catalyst is arranged on the catalyst storage rack.
The process for treating the waste gas by using the lithium power battery electrolyte waste gas treatment device comprises the following steps of:
s1, when the waste gas is used, the waste gas is collected and then enters an alkaline washing tower through a first air pipe to remove HF, acidic pollution factors, partial components which are easily dissolved in aqueous solution and partial particulate matters in the waste gas, and most of water vapor in the waste gas;
s2, delivering the waste gas treated by the alkaline washing tower to a water washing tower for further treatment through a second air pipe, and removing residual water soluble in aqueous solution and larger particles and dust and most of water vapor in the waste gas after alkaline washing;
s3, the waste gas subjected to water washing treatment and dehydration and dehumidification by the water washing tower enters a filter through a third air pipe for filtering and purifying, and mist, particles, floccules, dust and macromolecular impurities with the particle size of more than or equal to 0.5 mu m in the waste gas are removed;
s4, the waste gas filtered by the filter enters a first fixed bed adsorber through a fourth air pipe and a first valve, pollution factors such as dimethyl carbonate, methyl ethyl carbonate and ethylene carbonate in the waste gas are adsorbed, and the waste gas which is adsorbed and purified and reaches the national emission standard is discharged through a second valve, a fifth air pipe, an adsorption fan, a sixth air pipe and a chimney;
s5, after zeolite in the first fixed bed adsorber is adsorbed to a certain pollution factor, the adsorption saturation needs desorption regeneration, at the moment, the first valve and the second valve are closed, and at the same time, the third valve and the fourth valve are opened, and waste gas is switched to the second fixed bed adsorber for adsorption purification;
s6, the zeolite which is used as the adsorbent and is adsorbed and saturated in the first fixed bed adsorber and the second fixed bed adsorber can be desorbed and regenerated through the desorption component, so that the recycling is realized.
The invention has the technical effects and advantages that:
1. the invention can realize the purification of the organic waste gas of VOCs, avoid polluting the atmosphere, ensure the physical and psychological health of staff and surrounding residents, has high total air quantity, low concentration, unstable waste gas flow and concentration, has the organic waste gas purification efficiency of VOCs of more than or equal to 98 percent, is stable in operation, safe and reliable, has the non-methane total hydrocarbon, HF, particulate matters and the like of the discharge port far lower than the environmental protection discharge standard, and can be stable for a long time;
2. the invention can realize the desorption regeneration of the zeolite used as the adsorbent during purification and realize the recycling of the zeolite;
the invention can realize the purification of VOCs organic waste gas, avoid polluting the atmosphere, ensure the physical and psychological health of staff and surrounding residents, has the advantages of large total air quantity, low concentration, unstable waste gas flow and concentration, has the organic waste gas purification efficiency of VOCs of more than or equal to 98 percent, stable operation, safety and reliability, has the non-methane total hydrocarbon, HF, particulate matters and the like of a discharge port far lower than the environmental protection discharge standard, can be stable for a long time, can realize the desorption regeneration of zeolite serving as an adsorbent during purification, and realizes the recycling of the zeolite.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of an exhaust gas treatment device for an electrolyte of a lithium power battery according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing a cross-sectional structure of an exhaust gas treatment device for an electrolyte of a lithium power battery according to an embodiment of the present invention;
fig. 3 is a schematic diagram showing a top view structure of an apparatus for treating exhaust gas of an electrolyte of a lithium power battery according to an embodiment of the present invention;
FIG. 4 shows a schematic cross-sectional view of a catalytic combustion device according to an embodiment of the present invention;
in the figure: 1. a first air duct; 2. an alkaline washing tower; 201. a tower body; 202. a liquid storage tank; 203. a water pump; 204. a filler layer; 205. a spray pipe; 206. a dehydrated filler layer; 3. a second air duct; 4. a water washing tower; 5. a third air duct; 6. a filter; g4, a primary filter; f7, a medium-efficiency filter; f9, a high-efficiency filter; 7. a fourth air duct; 8. a first valve; 9. a first fixed bed adsorber; 10. a second valve; 11. a fifth air duct; 12. a third valve; 13. a second fixed bed adsorber; 14. a fourth valve; 15. an adsorption fan; 16. a sixth air duct; 17. a chimney; 18. supplementing a cooling air port; 19. an air supplementing fan; 21. a seventh air duct; 22. a fifth valve; 23. a mixing box; 24. an eighth air duct; 25. a sixth valve; 26. a seventh valve; 27. an eighth valve; 28. a ninth valve; 29. a ninth air duct; 30. a flame arrester; 31. a tenth air duct; 32. a catalytic combustion device; 321. a heater; 322. a catalyst; 323. a heat exchanger; 33. an eleventh air duct; 34. a desorption fan; 35. a twelfth duct; 36. a tenth valve; 37. a thirteenth air duct; 38. an eleventh valve; 39. fourteenth tuber pipe.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a lithium power battery electrolyte waste gas treatment device, as shown in figures 1-4, comprising a first air pipe 1, wherein one end of the first air pipe 1 is connected with an alkaline cleaning tower 2, the top of the alkaline cleaning tower 2 is connected with a second air pipe 3, the other end of the second air pipe 3 is connected with a water cleaning tower 4, the top of the water cleaning tower 4 is connected with a third air pipe 5, the other end of the third air pipe 5 is connected with a filter 6, one side of the filter 6 far away from the third air pipe 5 is connected with a fourth air pipe 7, one side of the filter 6 is provided with a first fixed bed adsorber 9 and a second fixed bed adsorber 13, the fourth air pipe 7 is arranged as a three-way pipe, two ends of the fourth air pipe 7 far away from the filter 6 are respectively communicated with the first fixed bed adsorber 9 and the second fixed bed adsorber 13, two ends of the fourth air pipe 7 communicated with the first fixed bed adsorber 9 and the second fixed bed adsorber 13 are respectively provided with a first valve 8 and a third valve 12, a fifth air pipe 11 is arranged above the first fixed bed adsorber 9 and the second fixed bed adsorber 13, the fifth air pipe 11 is a three-way pipe, two ends of the fifth air pipe 11 are respectively communicated with the tops of the first fixed bed adsorber 9 and the second fixed bed adsorber 13, two ends of the fifth air pipe 11, which are communicated with the first fixed bed adsorber 9 and the second fixed bed adsorber 13, are respectively provided with a second valve 10 and a fourth valve 14, one end of the fifth air pipe 11, which is far away from the first fixed bed adsorber 9 and the second fixed bed adsorber 13, is provided with an adsorption fan 15, the other end of the adsorption fan 15 is connected with a chimney 17 through a sixth air pipe 16, a desorption component for desorbing and regenerating the first fixed bed adsorber 9 and the second fixed bed adsorber 13 is arranged outside the first fixed bed adsorber 9 and the second fixed bed adsorber 13, the waste gas is collected and enters an alkaline washing tower 2 through a first air pipe 1 to remove HF, acidic pollution factors, partial components which are easy to dissolve in aqueous solution and partial particles in the waste gas, and most of water vapor in the waste gas, the waste gas treated by the alkaline washing tower 2 is sent to a water washing tower 4 for further treatment through a second air pipe 3 to remove residual water which is easy to dissolve in aqueous solution, larger particles and dust in the waste gas and most of water vapor in the waste gas after alkaline washing, the waste gas after water washing treatment and dehydration and dehumidification of the water washing tower 4 enters a filter 6 through a third air pipe 5 to be filtered and purified, mist, particles, floccules, dust and macromolecular impurities with the particle size more than or equal to 0.5 mu m in the waste gas are removed, the waste gas after the filtration of the filter 6 enters a first fixed bed adsorber 9 through a fourth air pipe 7 and a first valve 8, the pollution factors such as dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate and the like in the waste gas are adsorbed, the waste gas after being adsorbed and purified to reach the national emission standard is discharged by the second valve 10, the fifth air pipe 11, the adsorption fan 15, the sixth air pipe 16 and the chimney 17, so that the pollution to the atmosphere can be avoided, the physical and mental health of staff and surrounding residents is ensured, after zeolite in the first fixed bed adsorber 9 is adsorbed to a certain pollution factor amount, the adsorption saturation needs to be desorbed and regenerated, at the moment, the first valve 8 and the second valve 10 are closed, meanwhile, the third valve 12 and the fourth valve 14 are opened, the waste gas is switched to the second fixed bed adsorber 13 for adsorption and purification, the total air quantity of equipment is large, the concentration is low, the waste gas flow rate and the organic waste gas purification efficiency of volatile VOCs is more than or equal to 98%, the operation is stable, the non-methane total hydrocarbon and HF of the discharge port is safe and reliable, the particulate matters and the like are far lower than the environmental emission standard, and can be stable for a long time.
As shown in fig. 3, the desorption assembly comprises an air supplementing blower 19, one end of the air supplementing blower 19 is provided with an air supplementing air inlet 18, the other end of the air supplementing blower 19 is connected with a mixed flow box 23 through a seventh air pipe 21, a fifth valve 22 is arranged on the seventh air pipe 21, one side of the mixed flow box 23 is provided with an eighth air pipe 24, the eighth air pipe 24 is arranged as a three-way pipe, two ends of the eighth air pipe 24 far away from the mixed flow box 23 are respectively communicated with the first fixed bed adsorber 9 and the second fixed bed adsorber 13, an eighth valve 27 and a sixth valve 25 are respectively arranged outside two ends of the eighth air pipe 24 far away from the mixed flow box 23, the outside of the first fixed bed adsorber 9 and the second fixed bed adsorber 13 is jointly connected with a ninth air pipe 29, the ninth air pipe 29 is arranged as a three-way pipe, two ends of the ninth air pipe 29 communicated with the first fixed bed adsorber 9 and the second fixed bed adsorber 13 are respectively provided with a ninth valve 28 and a seventh valve 26, one end of the ninth air pipe 29 far away from the first fixed bed adsorber 9 and the second fixed bed adsorber 13 is provided with a flame arrester 30, the other side of the flame arrester 30 is provided with a tenth air pipe 31, one end of the tenth air pipe 31 far away from the flame arrester 30 is connected with a catalytic combustion device 32, the other side of the catalytic combustion device 32 is provided with an eleventh air pipe 33, the other end of the eleventh air pipe 33 is connected with a desorption fan 34, the other side of the desorption fan 34 is connected with a twelfth air pipe 35, the twelfth air pipe 35 is provided with a three-way pipe, the two ends of the twelfth air pipe 35 far away from the desorption fan 34 are respectively connected with a thirteenth air pipe 37 and a fourteenth air pipe 39, the other end of the fourteenth air pipe 39 is communicated with a mixing box 23, the other end of the thirteenth air pipe 37 is communicated with a sixth air pipe 16, a tenth valve 36 is arranged outside the thirteenth air pipe 37, an eleventh valve 38 is arranged outside the fourteenth air pipe 39, the zeolite is arranged in the first fixed bed adsorber 9 and the second fixed bed adsorber 13, the zeolite can be used as an adsorbent to adsorb pollution factors such as dimethyl carbonate, ethylmethyl carbonate and ethylene carbonate in waste gas, when the zeolite in the first fixed bed adsorber 9 needs to be desorbed and regenerated, the air supplementing blower 19, the desorption blower 34, the fifth valve 22, the eighth valve 27, the ninth valve 28 and the eleventh valve 38 are opened, the sixth valve 25, the seventh valve 26 and the tenth valve 36 are closed, newly supplemented cold air enters the mixed flow box 23 through the air supplementing opening 18, the seventh air pipe 21 and the fifth valve 22 under the action of the desorption blower 34, enters the first fixed bed adsorber 9, the ninth valve 28, the ninth air pipe 29, the flame arrestor 30 and the tenth air pipe 31 through the eighth air pipe 24 and the eighth valve 27 into the catalytic combustion device 32, the heater 321 in the catalytic combustion device 32 is opened, the newly added cold air is circularly heated until the temperature required by the desorption and regeneration of zeolite, the heated gas is circularly fed into the first fixed bed adsorber 9 to desorb zeolite, the desorbed high-concentration waste gas is fed into the catalytic combustion device 32 to be catalytically combusted, and finally is decomposed into harmless CO2 and H2O, and simultaneously heat is generated, the decomposed heat is used for heating the organic waste gas fed through the heat exchanger 323, when the concentration of the organic waste gas reaches a certain concentration, the heat required by heat release and heat exchange reaches balance, the heating is not needed to be continuously carried out, the high-concentration organic waste gas is treated through self balance, the mixed flow cooling is carried out on the gas decomposed into harmless gas through the catalytic combustion device 32 by controlling a part of the tenth valve 36 and the eleventh valve 38, the desorption is carried out on the zeolite adsorbent through continuous circulation, the other part is led to high emission through a tenth valve 36, a sixth air pipe 16 and a chimney 17. And when the zeolite in the second fixed bed adsorber 13 is saturated, the desorption regeneration is performed in the same way, and the two fixed bed adsorbers alternately circulate for adsorption and desorption regeneration.
As shown in fig. 2, the alkaline washing tower 2 comprises a tower body 201, a liquid storage tank 202 is arranged at the front side of the tower body 201, a water pump 203 is arranged at the top of the liquid storage tank 202, a spray pipeline 205 is fixedly connected above the inside of the tower body 201, a spray nozzle is arranged at the bottom of the spray pipeline 205, a water pumping end of the water pump 203 is communicated with the liquid storage tank 202, a water outlet end of the water pump 203 is communicated with the spray pipeline 205 through a water pipe, a filler layer 204 is arranged inside the tower body 201 and below the spray pipeline 205, a dehydration filler layer 206 is arranged inside the tower body 201 and above the spray pipeline 205, a screen plate for supporting the filler layer 204 and the dehydration filler layer 206 is fixedly arranged inside the tower body 201, the structure composition of the water washing tower 4 and the alkaline washing tower 2 is the same, the waste gas is collected and then enters the alkaline washing tower 2 through the first air pipe 1, the waste gas passes through a PP hollow ball packing layer with the diameter of 50mm from bottom to top, the water pump 203 is started to pump sodium hydroxide lye stored in the liquid storage tank 202 out, the sodium hydroxide lye is injected into the spraying pipeline 205 through the water pipe, then the waste gas is sprayed out through the spray nozzle, the waste gas is in countercurrent contact with the sodium hydroxide lye for neutralization and absorption, HF, acidic pollution factors, components and partial particles which are easy to dissolve in aqueous solution in the waste gas are removed, most of water vapor in the waste gas is removed through the dehydration packing layer 206, and the dehydration packing layer 206 can remove the water vapor in the waste gas through the dehydration packing layer 206 in the prior art, which is not repeated herein.
As shown in fig. 2, the packing layer 204 is composed of PP hollow sphere packing with a diameter of 50mm, so that HF, acidic pollution factors, a part of components easily dissolved in aqueous solution and a part of particulates in the waste gas can be removed by matching with sprayed sodium hydroxide alkali liquor after the waste gas passes through the packing layer 204.
As shown in fig. 2, the liquid storage tank 202 of the alkaline washing tower 2 stores sodium hydroxide lye therein, and the liquid storage tank 202 of the water washing tower 4 stores aqueous solution therein, so that the spray heads in the alkaline washing tower 2 can spray sodium hydroxide lye, and the spray heads in the water washing tower 4 can spray aqueous solution.
As shown in fig. 2, the filter 6 is internally provided with a primary filter G4, a middle-effect filter F7 and a high-efficiency filter F9 in sequence, the waste gas after water washing treatment and dehydration and dehumidification by the water washing tower 4 enters the filter 6 through a third air pipe 5 for filtration and purification, the filter 6 is internally provided with the primary filter G4, the middle-effect filter F7 and the high-efficiency filter F9 in sequence, and the waste gas is filtered by the filter 6 to remove mist, particles, floccules, dust and macromolecular impurities with the particle size of more than or equal to 0.5 μm in the waste gas.
As shown in fig. 2, the first fixed bed adsorber 9 and the second fixed bed adsorber 13 are internally provided with a fixed bed, a honeycomb zeolite is arranged above the fixed bed, pores through which exhaust gas passes are formed in the fixed bed, pollution factors such as dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate and the like in the exhaust gas can be adsorbed by the zeolite, and the fixed bed adsorber performs adsorption concentration on the exhaust gas of VOCs by using the process of adsorption-desorption concentration-cooling, and the basic principle is as follows:
adsorption: the waste gas is sent to a first fixed bed adsorber 9 after passing through a pre-filter 6, VOCs in the organic waste gas are adsorbed and removed by zeolite materials, and the organic waste gas is directly discharged or enters a next-stage treatment device after being purified.
And (3) desorption: the adsorbent is desorbed and concentrated by treating with small air volume hot air, and the concentration multiple is generally 5-25 times.
And (3) cooling: the temperature of the adsorption material regenerated by hot air is higher, the adsorption capacity is reduced, and the adsorption material needs to be re-adsorbed after cooling.
The honeycomb zeolite block fixed bed adsorption concentration system is provided with temperature on-line monitoring, and the principle of the temperature on-line monitoring is the same as that of the prior art, so that details are not repeated here, and the temperature on-line monitoring is related to a CO system:
a. when the desorption temperature is higher than a set value, the equipment system immediately sends out an audible and visual alarm, and automatically starts a cooling device to remind an operator to check the equipment;
b. when the desorption temperature exceeds the set highest temperature, an alarm signal is sent immediately, simultaneously, the valves of the waste gas and the CO system are automatically cut off, the environmental protection department of the CO system bypass function is started for confirmation, and the original waste gas is automatically switched into an emergency mode;
the pressure of the honeycomb zeolite block fixed bed adsorption concentration system is monitored on line, and when the pressure reaches a set value, the system immediately sends out audible and visual alarm through logic control of a PLC system, so that an operator is reminded to clean the system.
As shown in fig. 4, the catalytic combustion device 32 comprises a housing, and a heater 321, a catalyst storage rack and a heat exchanger 323 are sequentially arranged in the housing from bottom to top, and a catalyst 322 is arranged on the catalyst storage rack.
The catalytic combustion device 32 is provided with a thermocouple, a switching valve, a safety valve, a heater 321, a pressure sensor, a catalyst 322 and the like, the desorbed high-concentration organic waste gas is introduced into the catalytic combustion device 32, the temperature of the high-concentration organic waste gas is increased to the temperature required by the reaction through the heater 321 (the heater 321 can be an electric heater or a burner), the waste gas is subjected to oxidation exothermic reaction under the action of the catalyst 322 to generate harmless H2O and CO2, the decomposed heat is heated by the heat exchanger 323 to enter the organic waste gas of the catalytic bed, when the concentration of the organic waste gas reaches a certain concentration, the heat required by heat release and heat exchange reaches balance, the heating is not required to be continued, and the high-concentration organic waste gas is treated through self-balancing. The heat exchanger 323 is integrated with the catalytic combustion device 32, so that the heat exchange efficiency is improved, and the occupied area of the equipment is reduced.
The catalytic combustion is flameless combustion, so the safety is good, the combustion temperature is required to be low, the reaction temperature is maintained at 280-350 ℃, the residence time of the waste gas in the catalytic combustion device 32 is not less than 1s, and the consumption of auxiliary fuel is low due to the low reaction temperature; less restrictions are placed on combustible component concentration and heating value.
The catalytic combustion device 32 is provided with an on-line VOCs concentration measuring LEL and an alarm device at the system inlet, the on-line VOCs concentration measuring LEL and the alarm device are the same as the on-line VOCs concentration measuring LEL and the alarm device in the prior art, the principle of which is not repeated here, the inlet VOCs concentration is displayed, and when the VOCs concentration is higher than a certain set value, the system immediately gives out an audible and visual alarm to remind an operator to check equipment; when the concentration of the VOCs in the gas exceeds a specified dangerous value, an alarm signal is immediately sent, the supply of the waste gas and the catalytic combustion device 32 system is automatically cut off, the bypass function of the catalytic combustion device 32 system is started, the original waste gas is automatically switched to an emergency mode, and the requirements of environmental protection are met in emergency situations;
the temperature of the system of the catalytic combustion device 32 is monitored on line, the original waste gas is compared with the system of the catalytic combustion device 32, when the temperature in the device is higher than a certain set value, the system immediately gives out an audible and visual alarm, and a cooling device is automatically started to remind an operator to check equipment; when the temperature in the device exceeds the set highest temperature, an alarm signal is immediately sent out, and the original waste gas and the supply of the catalytic combustion device 32 system are automatically cut off, the bypass function of the catalytic combustion device 32 system is started, and the original waste gas is automatically switched to an emergency mode;
the pressure of the catalytic combustion device 32 system is monitored on line and compared with the original waste gas and the catalytic combustion device 32 system, when the pressure reaches a set value, the system immediately gives out an audible and visual alarm to remind an operator to clean the system, meanwhile, the supply of the original waste gas and the catalytic combustion device 32 system is cut off, the bypass function of the catalytic combustion device 32 system is started, and the original waste gas is automatically switched into an emergency mode;
multiple safety protection measures are adopted to ensure the safe and reliable operation of the process equipment.
The process for treating the waste gas by using the lithium power battery electrolyte waste gas treatment device comprises the following steps of:
s1, when the waste gas is used, the waste gas is collected and then enters the alkaline tower 2 through the first air pipe 1 to remove HF, acidic pollution factors, partial components which are easily dissolved in aqueous solution and partial particulate matters in the waste gas, and most of water vapor in the waste gas;
s2, the waste gas treated by the alkaline washing tower 2 is sent to a water washing tower 4 for further treatment through a second air pipe 3, and residual water vapor which is easy to dissolve in aqueous solution and larger particles and dust and is in the waste gas after alkaline washing is removed;
s3, the waste gas subjected to water washing treatment and dehydration and dehumidification by the water washing tower 4 enters a filter 6 through a third air pipe 5 for filtering and purifying, and mist, particles, floccules, dust and macromolecular impurities with the particle size of more than or equal to 0.5 mu m in the waste gas are removed;
s4, the waste gas filtered by the filter 6 enters a first fixed bed adsorber 9 through a fourth air pipe 7 and a first valve 8, pollution factors such as dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate and the like in the waste gas are adsorbed, and the waste gas after being adsorbed and purified to reach the national emission standard is discharged in a high-pressure manner through a second valve 10, a fifth air pipe 11, an adsorption fan 15, a sixth air pipe 16 and a chimney 17;
s5, after zeolite in the first fixed bed adsorber 9 is adsorbed to a certain pollution factor, adsorption saturation requires desorption regeneration, at the moment, the first valve 8 and the second valve 10 are closed, meanwhile, the third valve 12 and the fourth valve 14 are opened, and waste gas is switched to the second fixed bed adsorber 13 for adsorption purification;
s6, the zeolite which is used as the adsorbent and is adsorbed and saturated in the first fixed bed adsorber 9 and the second fixed bed adsorber 13 can be desorbed and regenerated through a desorption component, so that the zeolite can be recycled.
Working principle: when the waste gas collecting and collecting device is used, waste gas enters the alkaline washing tower 2 through the first air pipe 1, passes through the filler layer 204 from bottom to top, starts the water pump 203 to pump sodium hydroxide lye stored in the liquid storage tank 202 out, is injected into the spray pipeline 205 through the water pipe, is sprayed out through the spray nozzle, and is in countercurrent contact with the sodium hydroxide lye for neutralization and absorption, so that HF, acidic pollution factors, partial components and partial particles which are easy to dissolve in aqueous solution in the waste gas are removed, and most of water vapor in the waste gas is removed through the dehydration filler layer 206;
the waste gas treated by the alkaline washing tower 2 is sent to a water washing tower 4 for further treatment through a second air pipe 3, a PP hollow sphere packing layer with the diameter of 50mm, namely a packing layer 204 is arranged in the water washing tower 4, a water pump 203 is started to pump water storage solution stored in a liquid storage tank 202 into a spray pipeline 205 through a water pipe, then the water storage solution is sprayed out through a spray head, the waste gas sequentially passes through the packing layer 204 and a dehydration packing layer 206, the packing layer 204 is in countercurrent contact with the circulating sprayed water solution, residual water solution which is easy to dissolve after alkaline washing, larger particles and dust are removed from the waste gas, and most of water vapor in the waste gas is removed through the dehydration packing layer 206;
the waste gas after water washing treatment and dehydration and dehumidification by the water washing tower 4 enters a filter 6 from a third air pipe 5 for filtration and purification, a primary filter G4, a middle-effect filter F7 and a high-efficiency filter F9 are sequentially arranged in the filter 6, and the waste gas is subjected to filtration treatment by the filter to remove mist, particles, floccules, dust and macromolecular impurities with the particle size of more than or equal to 0.5 mu m;
the waste gas filtered by the filter 6 enters a first fixed bed adsorber 9 through a fourth air pipe 7 and a first valve 8, and honeycomb zeolite is filled in the first fixed bed adsorber 9 as an adsorbent to adsorb pollution factors such as dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate and the like in the waste gas;
the waste gas after reaching the national emission standard after adsorption purification is discharged by the second valve 10, the fifth air pipe 11, the adsorption fan 15, the sixth air pipe 16 and the chimney 17.
When zeolite in the first fixed bed adsorber 9 is adsorbed to a certain pollution factor, desorption regeneration is needed by adsorption saturation, at the moment, the first valve 8 and the second valve 10 are closed, meanwhile, the third valve 12 and the fourth valve 14 are opened, waste gas is switched to the second fixed bed adsorber 13 for adsorption purification, zeolite is arranged in each of the first fixed bed adsorber 9 and the second fixed bed adsorber 13, zeolite can be used as an adsorbent for adsorbing pollution factors such as dimethyl carbonate, methyl ethyl carbonate and ethylene carbonate in the waste gas, when the zeolite in the first fixed bed adsorber 9 needs to be subjected to desorption regeneration, the air supplementing blower 19, the desorption blower 34, the fifth valve 22, the eighth valve 27, the ninth valve 28 and the eleventh valve 38 are opened, the sixth valve 25, the seventh valve 26 and the tenth valve 36 are closed, and newly supplemented cold air is subjected to the action of the air supplementing blower 19 and the desorption blower 34, the fresh air enters the mixed flow box 23 through the cold air supplementing port 18, the seventh air pipe 21 and the fifth valve 22, enters the first fixed bed adsorber 9, the ninth valve 28, the ninth air pipe 29, the flame arrester 30 and the tenth air pipe 31 through the eighth air pipe 24 and the eighth valve 27, enters the catalytic combustion device 32, the heater 321 in the catalytic combustion device 32 is started to circularly heat and raise the temperature of the newly-supplemented cold air until the temperature required by zeolite desorption regeneration, the heated gas circularly enters the first fixed bed adsorber 9 to desorb the zeolite, the desorbed high-concentration waste gas enters the catalytic combustion device 32 to be catalytically combusted, finally, the desorbed high-concentration waste gas is decomposed into harmless CO2 and H2O, heat is generated, the heat generated by decomposition heats the entered organic waste gas through the heat exchanger 323, and when the concentration of the organic waste gas reaches a certain concentration, the heat required by heat release and heat exchange reaches balance, no continuous heating is needed, high-concentration organic waste gas is treated through self balance, harmless gas is decomposed into gas through the catalytic combustion device 32, mixed flow is carried out to reduce the temperature to the temperature required by desorption through a part of control of the tenth valve 36 and the eleventh valve 38, the zeolite adsorbent is continuously circulated to carry out desorption, and the other part of the gas is discharged through the tenth valve 36, the sixth air pipe 16 and the chimney 17 in a high-emission mode. And when the zeolite in the second fixed bed adsorber 13 is saturated, the desorption regeneration is performed in the same way, and the two fixed bed adsorbers alternately circulate for adsorption and desorption regeneration.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. The utility model provides a lithium power battery electrolyte waste gas treatment device, includes first tuber pipe (1), its characterized in that: one end of the first air pipe (1) is connected with an alkaline washing tower (2), the top of the alkaline washing tower (2) is connected with a second air pipe (3), the other end of the second air pipe (3) is connected with a water washing tower (4), the top of the water washing tower (4) is connected with a third air pipe (5), the other end of the third air pipe (5) is connected with a filter (6), one side of the filter (6) far away from the third air pipe (5) is connected with a fourth air pipe (7), one side of the filter (6) is provided with a first fixed bed adsorber (9) and a second fixed bed adsorber (13), the fourth air pipe (7) is arranged into a three-way pipe, two ends of the fourth air pipe (7) far away from the filter (6) are respectively communicated with the first fixed bed adsorber (9) and the second fixed bed adsorber (13), two ends of the fourth air pipe (7) communicated with the first fixed bed adsorber (9) and the second fixed bed adsorber (13) are respectively provided with a first valve (8) and a third valve adsorber (12), one side of the filter (6) is provided with a fifth fixed bed adsorber (11), the two ends of the fifth air pipe (11) are respectively communicated with the tops of the first fixed bed adsorber (9) and the second fixed bed adsorber (13), the two ends of the fifth air pipe (11) communicated with the first fixed bed adsorber (9) and the second fixed bed adsorber (13) are respectively provided with a second valve (10) and a fourth valve (14), one end, far away from the first fixed bed adsorber (9) and the second fixed bed adsorber (13), of the fifth air pipe (11) is provided with an adsorption fan (15), the other end of the adsorption fan (15) is connected with a chimney (17) through a sixth air pipe (16), and a desorption component for desorbing and regenerating the first fixed bed adsorber (9) and the second fixed bed adsorber (13) is arranged outside the first fixed bed adsorber and the second fixed bed adsorber (13);
the desorption component comprises a cold air supplementing fan (19), one end of the cold air supplementing fan (19) is provided with a cold air supplementing port (18), the other end of the cold air supplementing fan (19) is connected with a mixed flow box (23) through a seventh air pipe (21), a fifth valve (22) is arranged on the seventh air pipe (21), an eighth air pipe (24) is arranged on one side of the mixed flow box (23), the eighth air pipe (24) is arranged as a three-way pipe, two ends of the eighth air pipe (24) far away from the mixed flow box (23) are respectively communicated with a first fixed bed adsorber (9) and a second fixed bed adsorber (13), an eighth valve (27) and a sixth valve (25) are respectively arranged outside two ends of the eighth air pipe (24) far away from the mixed flow box (23), a ninth air pipe (29) is jointly connected with the outside of the first fixed bed adsorber (9) and the second fixed bed adsorber (13), the ninth air pipe (29) is arranged as a three-way pipe, two ends of the eighth air pipe (24) far away from the mixed flow box (23) are respectively communicated with the first fixed bed adsorber (9) and the second fixed bed adsorber (13), two ends of the eighth fixed bed adsorber (29) are respectively provided with a ninth valve (28), the novel flame arrester is characterized in that a tenth air pipe (31) is arranged on the other side of the flame arrester (30), one end, far away from the flame arrester (30), of the tenth air pipe (31) is connected with a catalytic combustion device (32), an eleventh air pipe (33) is arranged on the other side of the catalytic combustion device (32), a desorption fan (34) is connected with the other end of the eleventh air pipe (33), a twelfth air pipe (35) is connected with the other side of the desorption fan (34), the twelfth air pipe (35) is arranged as a three-way pipe, a thirteenth air pipe (37) and a fourteenth air pipe (39) are respectively connected to the two ends, far away from the desorption fan (34), of the twelfth air pipe (35), the other end of the fourteenth air pipe (39) is communicated with a mixing box (23), the other end of the thirteenth air pipe (37) is communicated with a sixth air pipe (16), a tenth valve (36) is arranged on the outer portion of the thirteenth air pipe (37), and an eleventh valve (38) is arranged on the outer portion of the fourteenth air pipe (39).
The inside of first fixed bed adsorber (9) and second fixed bed adsorber (13) is equipped with the fixed bed, the top of fixed bed is equipped with cellular zeolite, set up the gas pocket that supplies the waste gas to pass through on the fixed bed.
2. The lithium power battery electrolyte waste gas treatment device according to claim 1, wherein: the alkaline washing tower (2) comprises a tower body (201), a liquid storage tank (202) is arranged on the front side of the tower body (201), a water pump (203) is arranged at the top of the liquid storage tank (202), a spray pipeline (205) is fixedly connected to the upper portion of the interior of the tower body (201), a spray nozzle is arranged at the bottom of the spray pipeline (205), a water pumping end of the water pump (203) is communicated with the liquid storage tank (202), a water outlet end of the water pump (203) is communicated with the spray pipeline (205) through a water pipe, a packing layer (204) is arranged in the interior of the tower body (201) and below the spray pipeline (205), a dewatering packing layer (206) is arranged in the interior of the tower body (201) and above the spray pipeline (205), a screen plate for supporting the packing layer (204) and the dewatering packing layer (206) is fixedly arranged in the interior of the tower body (201), and the water washing tower (4) is identical to the alkaline washing tower (2).
3. The lithium power battery electrolyte waste gas treatment device according to claim 2, wherein: the packing layer (204) consists of PP hollow sphere packing with the diameter of 50 mm.
4. The lithium power battery electrolyte waste gas treatment device according to claim 2, wherein: sodium hydroxide lye is stored in the liquid storage tank (202) of the alkaline washing tower (2), and aqueous solution is stored in the liquid storage tank (202) of the water washing tower (4).
5. The lithium power battery electrolyte waste gas treatment device according to claim 1, wherein: the inside of the filter (6) is sequentially provided with a primary filter (G4), a medium-efficiency filter (F7) and a high-efficiency filter (F9).
6. The lithium power battery electrolyte waste gas treatment device according to claim 1, wherein: the catalytic combustion device (32) comprises a shell, wherein a heater (321), a catalyst storage rack and a heat exchanger (323) are sequentially arranged in the shell from bottom to top, and a catalyst (322) is arranged on the catalyst storage rack.
7. A process for treating exhaust gas by using the lithium power battery electrolyte exhaust gas treatment device according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
s1, when the device is used, waste gas is collected and then enters an alkaline washing tower (2) through a first air pipe (1) to remove HF, acidic pollution factors, partial components easy to dissolve in aqueous solution and partial particulate matters in the waste gas and remove most of water vapor in the waste gas;
s2, delivering the waste gas treated by the alkaline washing tower (2) to a water washing tower (4) for further treatment through a second air pipe (3), and removing residual water soluble in aqueous solution, larger particles and dust and most of water vapor in the waste gas after alkaline washing;
s3, the waste gas subjected to water washing treatment and dehydration and dehumidification by the water washing tower (4) enters a filter (6) through a third air pipe (5) for filtering and purifying, and mist, particles, floccules, dust and macromolecular impurities with the particle size of more than or equal to 0.5 mu m in the waste gas are removed;
s4, the waste gas filtered by the filter (6) enters a first fixed bed adsorber (9) through a fourth air pipe (7) and a first valve (8), pollution factors of dimethyl carbonate, methyl ethyl carbonate and ethylene carbonate in the waste gas are adsorbed, and the waste gas after being adsorbed and purified to reach the national emission standard is discharged in a high-emission mode through a second valve (10), a fifth air pipe (11), an adsorption fan (15), a sixth air pipe (16) and a chimney (17);
s5, after zeolite in the first fixed bed adsorber (9) is adsorbed to a certain pollution factor, desorption regeneration is needed for adsorption saturation, at the moment, the first valve (8) and the second valve (10) are closed, meanwhile, the third valve (12) and the fourth valve (14) are opened, and waste gas is switched to the second fixed bed adsorber (13) for adsorption purification;
s6, desorbing and regenerating the zeolite which is used as the adsorbent and is saturated in the first fixed bed adsorber (9) and the second fixed bed adsorber (13) through a desorption assembly, so that recycling is realized.
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